Add PartialMatch to logging / logentries (#482)

* .

* FluentAssertions

* .

* .

src/WireMock.Net.FluentAssertions/Assertions/WireMockAssertions.cs

@@ -0,0 +1,37 @@
+using System.Linq;
+using FluentAssertions;
+using FluentAssertions.Execution;
+using WireMock.Server;
+
+// ReSharper disable once CheckNamespace
+namespace WireMock.FluentAssertions
+{
+    public class WireMockAssertions
+    {
+        private readonly WireMockServer _instance;
+
+        public WireMockAssertions(WireMockServer instance, int? callsCount)
+        {
+            _instance = instance;
+        }
+
+        [CustomAssertion]
+        public AndConstraint<WireMockAssertions> AtAbsoluteUrl(string absoluteUrl, string because = "", params object[] becauseArgs)
+        {
+            Execute.Assertion
+                .BecauseOf(because, becauseArgs)
+                .Given(() => _instance.LogEntries.Select(x => x.RequestMessage).ToList())
+                .ForCondition(requests => requests.Any())
+                .FailWith(
+                    "Expected {context:wiremockserver} to have been called at address matching the absolute url {0}{reason}, but no calls were made.",
+                    absoluteUrl)
+                .Then
+                .ForCondition(x => x.Any(y => y.AbsoluteUrl == absoluteUrl))
+                .FailWith(
+                    "Expected {context:wiremockserver} to have been called at address matching the absolute url {0}{reason}, but didn't find it among the calls to {1}.",
+                    _ => absoluteUrl, requests => requests.Select(request => request.AbsoluteUrl));
+
+            return new AndConstraint<WireMockAssertions>(this);
+        }
+    }
+}